Field-ready kits

Every calculator on ShutterMath stays free forever. These kits are the polished, print-ready versions for photographers who want the answers in their bag, not just on screen.

Featured

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The Field Kit — 6 Printable Cheat Cards

Depth of field · Exposure · ND filters · Hyperfocal · Astro star exposure · Print resolution. Six A4 landscape cards, one PDF, print at home or laminate for the bag.

  • All values computed with the standard formulas — checked, not eyeballed
  • Worked examples on every card (85mm f/1.8 portrait, Milky Way, sunny 16…)
  • Instant download · free lifetime updates as the kit grows
Get the kit — $9 →
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The Field Handbook (coming soon)

The full 60+ page guide: DoF mastery, exposure, hyperfocal, astro, macro stacking and print — built from the same verified math, with workflows and case studies.

$19 · in production

Why buy when the tools are free?

Fair question. The calculators compute anything — the cards give you the answers without pulling out a phone: laminated, in your bag, readable in direct sun. The pack is a one-time $9 for the polished versions plus lifetime updates; it also keeps the free tools free.

What's inside

🃏 Depth of Field

H = f²/(N·c) + f, CoC per format, 50 mm reference table, portrait & landscape worked examples.

🃏 Exposure

EV formula, sunny 16, f-stop light scale, scene EV table, the compensate-in-pairs rule.

🃏 ND Filters

Every filter ND2→ND100000, base→result table, the 180° video rule for 24–120 fps.

🃏 Hyperfocal

H per format, the H/2 rule, and when to stack instead of stop down.

🃏 Astro

500/400/300 + the pixel-accurate NPF rule, worked Milky Way example.

🃏 Print Resolution

DPI by viewing distance, max print size for 12–61 MP, upscaling guidance.

Field kit FAQ

Are the online calculators still free?

Yes — 100%. Every tool on shuttermath.com stays free forever, no sign-up, no limits. The Field Kit is an optional, one-time purchase for the print-ready versions.

What do I get?

One PDF with a cover page and six A4-landscape cards. Print on A4 (or scale to A5/A6) at home, or send to a print shop and laminate.

How do I pay and receive it?

Checkout is hosted by Gumroad (cards, PayPal, Apple/Google Pay). You get an instant download link plus email delivery, and free updates whenever the kit is revised.

Can I print copies for clients or a studio?

The personal license covers unlimited prints for yourself. Studio/commercial display needs the Commercial License (coming soon).